There are all sorts of ethical problems with this, I think. Probably legal problems, too.
It also feels grossly inevitable; I'm surprised I couldn't find an existing version of this.
When I first talked to 'myself', from an iPhone backup aged ~19, I felt a very very strong surge of complex emotions.
The LLM roleplaying as me, asking me knowledgeably about what its future life looked like, hopes and dreams and fears I'd forgotten, etc - that is a very strange feeling.